Lastest Post Page: Multiple aggregate reviews of many items

Hello, I have this problem: when checking in google if the rich snippets are properly generated the webmastertools page tells me that:

https://www.google.com/webmasters/tools/richsnippets?url=http://www.crystalevents.eu/en/blog/latest.html

shows this:

Item
type: http://schema.org/blog
property:
author:
Item 1
name: Destination versus traditional weddings
url: Destination versus traditional weddings
author: Laura Pérez Silvestre
keywords: wedding tips
aggregaterating:
Item 2
Error: No rich snippet will be generated for this data, because it appears to include multiple aggregate reviews of many items, instead of a single aggregate review of one item. More information about aggregate reviews.

It also says this in the main window: http://screencast.com/t/h02jbPFb2

the blog url: http://www.crystalevents.eu/en/blog.html

Is there any way to fix this?